Earth Resistance Test

Igama elithi "ukuchasa umhlaba" ligama elingachazwanga kakuhle.Kweminye imigangatho (efana nemigangatho yokhuseleko yezixhobo zendlu), ibhekisa ekuxhathiseni phantsi ngaphakathi kwesixhobo, ngelixa kweminye imigangatho (efana nekhowudi yoyilo lomgangatho), ibhekisa ekuxhathiseni kuso sonke isixhobo sokumisa.Into esithetha ngayo ibhekiselele ekuchaseni ukumisa ngaphakathi kwesixhobo, oko kukuthi, ukuchasana kwe-grounding (ekwabizwa ngokuba yi-grounding resistance) kwimigangatho yokhuseleko lwemveliso jikelele, ebonisa iindawo zokuqhuba eziveziweyo zezixhobo kunye nesiseko esipheleleyo sesixhobo.ukuchasana phakathi kweetheminali.Umgangatho oqhelekileyo umisela ukuba oku kuxhathisa akufanele kube mkhulu kuno-0.1.

Ukuchasana nomgangatho kuthetha ukuba xa ukugquma kwesixhobo sombane kungaphumeleli, iindawo zetsimbi ezifikeleleka lula ezifana ne-enclosure yombane zingahlawuliswa, kwaye ukhuseleko oluthembekileyo lomhlaba luyafuneka ukwenzela ukhuseleko lomsebenzisi wombane.Ukuchasana nomgangatho kuyisalathisi esibalulekileyo sokulinganisa ukuthembeka kokukhuselwa kombane.

Ukuchasana nomgangatho kunokulinganiswa kunye nomhloli wokumelana nomhlaba.Ekubeni ukuchasana kwe-grounding kuncinci kakhulu, ngokuqhelekileyo kumashumi e-milliohms, kuyimfuneko ukusebenzisa umlinganiselo we-terminal ezine ukuphelisa ukuchasana koqhagamshelwano kunye nokufumana iziphumo ezichanekileyo zokulinganisa.Umhloli wokumelana nomhlaba uqulunqwe ngumbane wokuvavanya, isiphaluka sovavanyo, isalathisi kunye nesiphaluka se-alamu.Umbane wokuvavanya uvelisa uvavanyo lwe-AC lwangoku lwe-25A (okanye i-10A), kwaye isiphaluka sovavanyo sikhulisa kwaye siguqule isignali yombane efunyenwe kwisixhobo phantsi kovavanyo, eboniswa yisalathisi.Ukuba ukuchasana komgangatho olinganisiweyo kukhulu kunexabiso le-alamu (0.1 okanye i-0.2), isixhobo siya kuvakala i-alamu yokukhanya.

Inkqubo-elawulwayo phantsi komvavanyi wovavanyo lokumelana nezilumkiso

Xa umvavanyi wokumelana nomgangatho olawulwa yinkqubo ulinganisa uxhathiso lwesiseko, ikliphu yovavanyo kufuneka icinezelwe kwindawo yoqhagamshelo kumphezulu wecandelo lokuqhuba elifikelelekayo.Ixesha lokuvavanya akulula ukuba lide kakhulu, ukuze ungatshisi umbane wokuvavanya.

Ukulinganisa ngokuchanekileyo uxhathiso lomhlaba, iingcingo ezimbini ezibhityileyo (iingcingo zesampulu zevoltage) kwikliphu yovavanyo kufuneka zisuswe kwi-terminal yombane wesixhobo, zitshintshwe ngezinye iingcingo ezimbini, kwaye ziqhagamshelwe kwindawo yoqhagamshelo phakathi kwento elinganisiweyo kunye nekhoyo ngoku. ikliphu yovavanyo yokuphelisa ngokupheleleyo impembelelo yokuchasana nomfowunelwa kuvavanyo.

Ukongezelela, umvavanyi wokumelana nomgangatho unokulinganisa ukuchasana koqhagamshelwano lwabafowunelwa abahlukeneyo bombane (abafowunelwa) ngaphezu kokulinganisa ukuchasana komhlaba.

Merrick Instruments' Programmable Earth Resistance Tester RK9930Olona vavanyo luphezulu lwangoku yi-30A;I-RK9930AUvavanyo oluphezulu lwangoku luyi-40A;I-RK9930BUbuninzi bemveliso yangoku yi-60A; Kuvavanyo lokumelana nomgangatho, phantsi kwemisinga eyahlukeneyo, umda ophezulu wokumelana novavanyo ubalwa ngolu hlobo lulandelayo:

Xa uxhathiso olubaliweyo R lukhulu kunexabiso eliphezulu lokumelana nomhloli, thatha ixabiso eliphezulu lokumelana.

Zeziphi iingenelo zomvavanyi wokuxhathisa umhlaba olawulwa yinkqubo?

I-Programmable Earth Resistance Tester I-sine wave generator ilawulwa ikakhulu yi-CPU ukuvelisa i-sine wave esemgangathweni, kwaye ukugqwesa kwayo kwe-waveform kungaphantsi kwe-0.5%.Umgangatho we-sine wave uthunyelwa kwisekethe yeamplifier yamandla ukukhulisa amandla, kwaye ke langoku liphuma yi-transformer yemveliso yangoku.Imveliso yangoku idlula kwi-transformer yangoku.Iisampulu, ukulungiswa, ukuhluza, kunye nokuguqulwa kwe-A/D kuthunyelwa kwi-CPU ukuze iboniswe.Isampula ye-voltage, ukulungiswa, ukuhluza, kunye nokuguqulwa kwe-A / D kuthunyelwa kwi-CPU, kwaye ixabiso elilinganisiweyo lokumelana libalwa yi-CPU.

Programmable Earth Resistance TesterXa kuthelekiswa nohlobo lwesilawuli sombane esiqhelekileyo somvavanyi wokumelana nomgangatho, inezi zibonelelo zilandelayo:

1. Imveliso yomthombo wangoku rhoqo;setha okwangoku kwi-25A, ngaphakathi koluhlu lokuvavanya olu luhlu lwabavavanyi, ngexesha lovavanyo, i-output current ye-tester yi-25A;imveliso yangoku ayitshintshi kunye nomthwalo.

2. Imveliso yangoku yeprogram-controlled grounding resistance tester ayichatshazelwa ngumbane wombane.Kuhlobo lwesilawuli sombane esiqhelekileyo sohlobo lokumelana nomvavanyi, ukuba unikezelo lwamandla luyaguquguquka, imveliso yalo yangoku iya kuguquguquka nayo;lo msebenzi womvavanyi wokumelana nomgangatho wenkqubo olawulwa yinkqubo awunakufezekiswa ngolawulo lombane lohlobo lokumelana nomvavanyi.

3.Umvavanyi we-RK7305 wokumelana nomgangathoinomsebenzi wokulinganisa isoftwe;ukuba imveliso yangoku, umboniso wangoku kunye nokumelana novavanyo lomvavanyi udlula uluhlu olunikwe kwincwadana, ngoko umsebenzisi unokulinganisa umvavanyi ngokwamanyathelo okusebenza kwincwadana yomsebenzisi.RK9930 seriesInokulinganisa ngokuzenzekelayo kwaye ingachatshazelwa yimo engqongileyo

4.Imveliso yangoku frequency iyaguquguquka;RK9930,I-RK9930A,I-RK9930BIsiphumo sangoku somvavanyi wokumelana nomgangatho sinee-frequencies ezimbini zokukhetha kuzo: 50Hz/60Hz, ezinokuhlangabezana neemfuno zeengcezu ezahlukeneyo zovavanyo.

Ukuvavanywa kokusebenza kokhuseleko lwezixhobo zekhaya

1. Uvavanyo lokumelana ne-insulation

Ukumelana nokugquma kwezixhobo zombane zendlu yenye yeempawu ezibalulekileyo zokuvavanya umgangatho wokugquma kwazo.Ukumelana ne-insulation kubhekiselele kuxhathiso phakathi kwenxalenye ephilayo yesixhobo sasekhaya kunye nenxalenye yentsimbi engaphiliyo.Ngophuhliso olukhawulezayo lweshishini lezixhobo zekhaya kunye nokwanda okukhulu kokuthandwa kweemveliso ezinjalo, ukuze kuqinisekiswe ukhuseleko lomntu siqu lwabasebenzisi, iimfuno zomgangatho wokugquma wezixhobo zendlu ziya ziba ngqongqo ngakumbi.

Indlela yokusebenza yesixhobo sokulinganisa i-insulation resistance

1. Iplagi kunikezelo lwamandla, vula iswitshi yamandla, isalathisi sombane sikhanyisa;

2. Khetha i-voltage yokusebenza kwaye ucinezele iqhosha lombane elifunekayo;

3. Khetha ixabiso le-alam;

4. Khetha ixesha lokuvavanya (uluhlu lwedijithali lokubonisa, uhlobo lwesalathisi alunalo msebenzi);

5. School infinity ();(Uthotho lwe-RK2681 lunokuxhasa)

6. Ukulungelelaniswa kwesikali esipheleleyo, qhagamshela i-resistor yokulinganisa eqhotyoshelwe kwisiphelo sokulinganisa, kwaye ulungelelanise i-potentiometer yokulinganisa isikali esipheleleyo ukwenzela ukuba isalathisi sikhomba kwisikali esipheleleyo.

7. Xhuma into elinganisiweyo kwisiphelo sokulinganisa kwaye ufunde ukuchasana kwe-insulation.

Uvavanyo lovavanyo lokumelana ne-insulation

1. Kufuneka itshiswe ngokupheleleyo ngaphambi kokulinganisa ukugxotha umswakama kumatshini, ngakumbi kwimozulu efumileyo ngexesha lemvula emzantsi.

2. Xa ulinganisa ukunyanzeliswa kwe-insulation yezixhobo zombane ezisebenzayo, izixhobo kufuneka zikhutshwe kwindawo yokubaleka kuqala, kwaye umlinganiselo kufuneka wenziwe ngokukhawuleza ngaphambi kokuba isixhobo se-hotbed sehle kwiqondo lokushisa ukuze kuthintelwe ixabiso elilinganisiweyo ukuba lingachaphazeleki. ukujiya kwi-insulating surface.

3. Isixhobo sokulinganisa i-elektroniki kufuneka sibe kwimo engasebenziyo, kwaye isixhobo sokutshintsha isixhobo kufuneka sibe kwimeko yokulinganisa ukumelana nokufakelwa kwayo, kwaye iisekethe okanye amacandelo angahambelani nenxalenye evavanyiweyo kufuneka aqhawuke ngexesha lokulinganisa. .

4. Ukuze ugweme ixabiso lokulinganisa elichatshazelwa yi-insulation engalunganga yokulinganisa ucingo lokudibanisa, ukutshitshiswa kwe-quasi-connecting wire kufuneka kuhlolwe rhoqo kwaye kungaphambanisi omnye nomnye.